Type-writing machine



A. A. JOHNSON.

TYPE WRITING MACHINE. APPLICATION HLED MAY H. 1918.

Pmmd D90. 2,1919.

P 5. 1. H L 3 Ii /4 hue/fianl V/fnesseaplication Serial No. 176,488 filed June 23,

UNITED STATES PATENT GFFICE.

ARTHUR A. JOHNSUN, on NEW YORK, N. Y., AsSIG OR To UNDERWOODTYPEWRITEB COMPANY, OF NEW YORK, N. in, A CORPORATION OF DELA A E.

TYPE-WRITING MACHINE.

Specification f Letters Patent.

Patented Dec; 2, 1919.

Original application filed June 23, 1917, Serial N 0. 176,488. Divided and this application filed May 11, 1918.

A Serial No. 233,848.

To all whom it may concern: I

Be it known that I, Airmen A. JOHNSON, a citizen of the United States, residing in borough of the Bronx, in the county of the Bronx, city and State of New York, have invented certain new and useful Improvements in lyperiting Machines, of which the following is a specification.

This invention relates to typewriting machines, and more particularly to paper-feed ing mechanisn'i therefor.

This application is a division of my ap- A feature of the present invention is the provision of means for facilitating the manipulation of work-sheets in a typewriting machine, so that the sheets may be speedily inserted and accurately located at the proper place to receive thetypewriting operations, and also may be easily withdrawn preparatory t0 the writing of the next form.

To do this, the platen of the machine is provided with a driving membernvhich is connected thereto to rotate the platen major amounts. This driving member preferably comprises a gear-segment which is constantly in mesh with a gear carried by the platen axle. This gear-segment may be provided with a handle. by means of which the same may be rotated, either forwardly to advance the work, or rearwardly to facilitate manipulating or withdrawing the work from the platen.

In order 'to accurately locate the sheets at proper position to commence writing, when again advanced by the operation of the driver handle. the present invention provides a stop-mechanism which is normally ineffective to arrest the platen, but which is brought into operation automatically as the I driver is rapidly pulled forward. This stop-mechanism may comprise a plunger carried by the driverand having at one end a stop and at the other end a cam member, which engages a cam carried by the frame. The movement of the cam member past the cam frame causes the plungrr to movethe stop to position to engage a stop that is fixed to the frame. and thus arrest the driver. The movable stop strikes the fixed stop after the cam on the plungerhas moved past the fixed ram. Thus, when the arrested handle is released by the. operative. the stop. is ro-' turned by its spring to ineffective position, where 1t does not interfere with the feed ing of the work by the usual line-space mechanism, or by the usual finger-piece on the platen axle. The cam on the frame is pivotally mounted to permit'the free passage of the driver in one direction.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure -l is a plan view, showing my device as applied to an Underwood typewriting machine. 7

Fig. 2 is a side view of the parts shown in Fig. 1, the hand-crank being shown in its rearmost position in broken lines.

Fig. 3 is a front-elevation of the parts shown in Figs. 1 and 2, showing the handle as releasedby the operative after its arrest by the stop-mechanism of the present invention. i i

Fig. 4 is an enlarged detail view showing the parts in arrested position, the movable In order that the pack comprising the.

work and carbon-sheets may he gripped to the platen 1.. so as to feed therewith, there are provided pressure feed-rolls 5 and 6 of the usual type.

In addition to driving the platen 1 by the line-space lever 4.. it may also be driven both reversely and in an advancing direction a major amount. so as to withdraw the pack of work-sheets and carbon-sheets to permit their displacement. and return them to the platen. For this purpose. the plate axle .2 is provided. at one end, with a pinion 7 arranged to he engaged and driven by a gcar-.

segment 8. The gear-segment is mounted on a luuid-crank il'pivoted intermediate its ends at 10 in a bracket 11. secured to the end plate The hand-crank 9 is provided position in said figure, for the ,purpose of bringing the first line to be writtenupon on the work-sheets into printing position.

In order to speedily and accurately locate the initial writing line on the work-sheet at the printingline of the machine, the present invention provides a stop-mechanism for the hand-crank 9, which is automaticallybrought into operation at the proper time to accurately arrest the hand-crank When the work is in proper writing position. This stop comprises a plunger 13 guided against rotary movement and sliding through the body portion of the gear-segment On one end, the plunger 13 is provided with a head '14 normally held clear of a fixed stop 15 by means of a spring 16. During a forward movement of the upper end of the handcrank 9 to advance the platen, the other end of the plunger brings a cam surface 17 thereon into engagement with a cam surface 18 of a one way acting tappet or dog 19, which is mounted on the frame 3. The relative position of'the dog 19 and the stop 15 is such that as the hand-crank 9 is swung with a quick motion, the plunger will be projected by the. dog 19, so that its head or stop 14: will engage the fixed stop 15 before the spring 16 can return the plunger, which has cleared the dog 19, to its normal position. lVhen the stop 15 is struck by the hand-crank 9 the operative knows that the work-sheets and carbon-sheets are properly positioned for the initial line of writing.-

The dog 19 is pivotally mounted on a su port 20, so that it will yield when the ab rupt face 13 of the plunger 13 engages the abrupt face 19 of the dog 19. A spring 21 will return the dog 19 to its normal position after the plunger 13 has escaped past the do Zfter the crank 9 is stopped by the head 14 striking against the fixed stop 15, the operative releases the handle 12 and proceeds to typewrite. The release of the han-s dle 12 permits the head 14 of the stop to be moved by its spring 16 away from the fixed stop 15 to which it is held before the release of the handle 12 by frictional contact therewith. When in its arrested position, the cam portion 17 is located sulficiently past the dog 19, to be free to move to normal position without interference from the latter. Thus, after the handle is released this stop mechanism in no way interferes with the rotation of the platen, either by the usual line-space mechanism 4 or by the fingerpieces 2O secured to the platen axle 2.

about and means for Variations may be resorted to Within the feed movement of predetermined extent bv temporarily arresting said driving element at an intermediate point in its effective range of movement, said stop mechanism being also self releasable so as to permit further feeding movement of said platen in the same direction after thus limiting the extent of a quick feed, V

2. The combination with a platen, of a hand-crank for rotating said platen, a plunger carried by said hand-crank, a stop for interrupting the movement of said handcrank and said platen by obstructing said plunger, and a dog located to force said plunger into obstructing relation with said stop, intermediate the limits of travel of said hand-crank. 3. The combination with a platen, of a hand-crank for rotating said platen, a plunger carried by said interrupting the movement of said handcrank and said platen by obstructing said plunger, a dog located to force said plunger into obstructing relation with said stop, in-

termediate the limits of travel of said handcrank, and means for automatically clearing said plunger from said stop after it has passed said' dog when the driving pressure on said hand-crank is relieved.

4. The combination, with a revoluble platen, means for guiding Work sheets thereline spacing the same, of- 'a quick feed mechanism comprising a hand-crank, a stop for v driving element having a rotative connection with said platen, and a normally ineffective stop mechanism capable of being rendered effective to arrest saidv driving element at a predetermined point in its movement when manipulated rapidly to effect a quick feed of said platen, said stop mechanism being self releasable at the end of such manipulation to permit further feeding movement of said platen and its connected driving element in the same direction after thus determining the extent of the quick feed.

5. The combination, with a revoluble platen and means for guiding work sheets thereabout, of a quick feed mechanism comprising a driving element having a rotative connection with said platen and an automatic stop mechanism for bringing said movement of predetermined extent by automatically arresting said driving element at an intermediate point in its efiecti-ve range of movement, said stop mechanism being one Way acting and self releasable so as to permit further feeding movement of said driving element and its connected platen in said dog when engaging said stop, whereby the rotation of said platen may be temporarily interrupted, to determine a certain spacing of the sheets carried thereby.

7. The combination with a platen arranged to support'and manipulate carbon and work-sheets, of driving means for rotating said platen a'number of line-spaces at a time, and one-way acting interrupting means for stopping the continued move-v, ment of said platen in one directigp inter mediate limits of said rotation, and silent during the rotation of said platen in the other direction, so as to permit an uninterrupted movement between the limits of rotation of the platen. 8. The combination, with a revolubl platen, means for guiding, Work sheets thereabout and means for line-spacing the same, of a quick feed mechanism comprising a driving element having a rotative connection With said platen and a normally ineffective stop mechanism capable of being rendered effective to arrest said driving element at a predetermined point in its movement when manipulated rapidly to effect a quick feed of said platen, said stop mechanlsm being one way acting and self releas- 'able at the end of such manipulation to permit, further feeding movement of said driving element and its connected platen in] either direction after thus determining the v extent of a quick feed.

ARTHTTR A. J OHNSON. Witnesses: v i

' Rosn GERsTnIN, EDITH B. LIBBEY. 

